(a(i))[1]
Write down the polygon's mathematical name.
(a(ii))[2]
Show that the polygon's interior angle is $135^{\circ}$.
(b(i))[3]
Complete the table.
(b(ii))[1]
Write down the term-to-term rule for the line count in the sequence.
(b(iii))[1]
Work out the number of lines in Diagram 9.
(b(iv))[2]
Find an expression, in terms of $n$, for the number of lines in Diagram $n$.
(b(v))[2]
Find the value of $k$.